I've only ever used Deep Breath when testing it out initially and I've literally never used Last Ditch, so I'd be interested to hear if anyone's put these to good use as well.

Luck of the Mountaineer has a niche use in forcing treasure maps to pop. If you find one of those nodes that gives you a native +30% HQ chance and pop the +30% HQ skill on top of that, there's a pretty good chance that your first three swings will enable it. (Note that level 60 nodes seem to only have one type of map or the other even if you use this.)